package com.tanhua.server.service;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ArrayUtil;
import com.tanhua.autoconfig.template.OssTemplate;
import com.tanhua.commons.utils.Constants;
import com.tanhua.dubbo.api.MovementApi;
import com.tanhua.dubbo.api.UserInfoApi;
import com.tanhua.model.domain.UserInfo;
import com.tanhua.model.mongo.Movement;
import com.tanhua.model.vo.ErrorResult;
import com.tanhua.model.vo.MovementsVo;
import com.tanhua.model.vo.PageResult;
import com.tanhua.server.exception.BusinessException;
import com.tanhua.server.interceptor.UserHolder;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.*;
import java.util.stream.Collectors;

@Service
public class MovementService {
    @DubboReference
    private MovementApi movementApi;

    @Autowired
    private OssTemplate ossTemplate;

    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    @DubboReference
    private UserInfoApi userInfoApi;

    @Autowired
    private AmqpTemplate amqpTemplate;

    //发布动态
    public void publishMovement(Movement movement, MultipartFile[] imageContent) throws IOException {
        //1.判断发布动态的内容是否存在
        if (movement == null || (StringUtils.isEmpty(movement.getTextContent()) && ArrayUtil.isEmpty(imageContent))) {
            throw new BusinessException(ErrorResult.contentError());
        }
        //2.获取当前登录的用户id
        Long userId = UserHolder.getUserId();
        //3.将文件内容上传到阿里云oss，获取请求地址
        List<String> medias = new ArrayList<>();
        if (ArrayUtil.isNotEmpty(imageContent)) {
            for (MultipartFile multipartFile : imageContent) {
                String upload = ossTemplate.upload(multipartFile.getOriginalFilename(),
                        multipartFile.getInputStream());
                medias.add(upload);
            }
        }
        //4.将数据封装到Movement对象
        movement.setUserId(userId);
        movement.setMedias(medias);
        movement.setState(0);
        //5.调用Api完成发布动态
        movementApi.publish(movement);
        //发送动态审核消息
        amqpTemplate.convertSendAndReceive("tanhua.audit.exchange", "audit.movement", movement.getId().toHexString());
    }

    //查询个人动态
    public PageResult findByUserId(Long userId, Integer page, Integer pagesize) {
        //1.根据用户id，调用api查询个人动态内容（PageResult -- Movement）
        PageResult pr = movementApi.findByUserId(userId, page, pagesize);
        //2.获取PageResult中的item列表
        List<Movement> items = (List<Movement>) pr.getItems();
        //3.非空怕判断
        if (items == null) {
            return pr;
        }
//        4.循环数据列表
        UserInfo userInfo = userInfoApi.findById(userId);
        List<MovementsVo> list = new ArrayList<>();
        for (Movement item : items) {
            //5.一个Movement构建一个Vo对象
            MovementsVo vo = MovementsVo.init(userInfo, item);
            list.add(vo);
        }
        //6.构建返回值
        pr.setItems(list);
        return pr;
    }

    //查询好友动态
    public PageResult findFriendMovements(Integer page, Integer pagesize) {
        //1.获取当前用户的id
        Long userId = UserHolder.getUserId();
        //2.调用api查询当前用户好友发布的动态列表
        List<Movement> list = movementApi.findFriendMovements(page, pagesize, userId);
        //3.判断列表是否为空
        return getPageResult(page, pagesize, list);
    }

    //查询好友动态
    private PageResult getPageResult(Integer page, Integer pagesize, List<Movement> list) {
        if (CollUtil.isEmpty(list)) {
            return new PageResult();
        }
        //4.提取动态发布人的id列表
        List<Long> userIds = CollUtil.getFieldValues(list, "userId", Long.class);
        //5.根据用户的id列表获取用户详情
        Map<Long, UserInfo> map = userInfoApi.findByIds(userIds, null);
        //6.一个Movement构造一个vo对象
        List<MovementsVo> vos = new ArrayList<>();
        for (Movement movement : list) {
            UserInfo userInfo = map.get(movement.getUserId());
            if (userInfo != null) {
                MovementsVo vo = MovementsVo.init(userInfo, movement);
                //修复点赞状态的bug，判断hashKey是否存在
                String key = Constants.MOVEMENTS_INTERACT_KEY + movement.getId().toHexString();
                String hashKey = Constants.MOVEMENT_LIKE_HASHKEY + UserHolder.getUserId();
                if (redisTemplate.opsForHash().hasKey(key, hashKey)) {
                    vo.setHasLiked(1);
                }
                vos.add(vo);
            }
        }
        //7.构造PageResult对象并返回
        return new PageResult(page, pagesize, 0l, vos);
    }

    //查询推荐动态
    public PageResult findCommendMovements(Integer page, Integer pagesize) {
        //1.从redis中获取推荐数据
        String redisKey = Constants.MOVEMENTS_RECOMMEND + UserHolder.getUserId();
        String redisValue = redisTemplate.opsForValue().get(redisKey);
        //2.判断推荐数据是否存在
        List<Movement> list = Collections.EMPTY_LIST;
        if (StringUtils.isEmpty(redisValue)) {
            //3.如果不存在，调用api随机构造是10条动态数据
            list = movementApi.randomMovements(pagesize);
        } else {
            //4.如果存在，处理pid数据
            String[] values = redisValue.split(",");
            //判断当前页的起始条数是否小于数组总数
            if ((page - 1) * pagesize < values.length) {
                List<Long> pids = Arrays.stream(values).skip((page - 1) * pagesize)
                        .limit(pagesize).map(e -> Long.valueOf(e)).collect(Collectors.toList());
                //5.调用API根据PID数组查询动态数据
                list = movementApi.findMovementsByPids(pids);
            }
        }
        //6.调用公共方法构造返回值
        return getPageResult(page, pagesize, list);
    }

    //查询单条动态
    public MovementsVo findById(String movementId) {
        //1.调用Api查询动态详情
        Movement movement = movementApi.findById(movementId);
        //2.转化vo对象
        if (movement != null) {
            UserInfo userInfo = userInfoApi.findById(movement.getUserId());
            return MovementsVo.init(userInfo, movement);
        } else {
            return null;
        }
    }
}
